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No. Consider 15: 1,3,5,15

Every positive whole number has an even number of factors,

unless the number is a perfect square.

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Q: Do odd numbers always have an odd number of factors?
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Related questions

Is the product of an odd number of factors always a negative number?

Only if an odd number of the factors are negative numbers.


Numbers that have an odd number of factors?

Square numbers have an odd number of factors.


Can an odd number have odd numbers of factors?

Yes. Square numbers have an odd number of factors. 49 has three factors.


Numbers with an odd number of factors?

Square numbers have an odd number of factors.


What type of numbers has an odd number of factors?

Square numbers have an odd number of factors.


What middle numbers have an odd number of factors?

Square numbers have an odd number of factors.


Odd number of factors?

Square numbers have an odd number of factors.


What numbers with an odd numbers of factors?

Perfect squares have an odd number of factors.


Will a prime number always have an odd numbers of factors?

All prime numbers have only 2 factors which are themselves and one. Al prime numbers are odd numbers except for 2 which is the only even prime number.


What type of number has odd numbers as factors?

Both odd and even numbers may have odd numbers as factors.


What kind of factors have an odd number of factors?

Square numbers have an odd number of factors.


Which number has an odd number of different factors?

All square numbers have an odd number of factors.